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Folate (Vitamin B9) Blood Test: What Your Results Mean

Folate (vitamin B9) is a water-soluble B vitamin essential for DNA synthesis, cell division, and the formation of red blood cells. It is particularly critical during early pregnancy for preventing neural tube defects in the developing baby. Folate is obtained from food (especially leafy greens, legumes, and fortified foods) and is stored in the liver for a limited period. Unlike vitamin B12, folate stores are depleted within weeks to months of poor intake.

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Normal Range

3 – 17 ng/mL

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Unit

ng/mL

What Your Results Mean

Normal

A normal folate level indicates adequate dietary intake and absorption of vitamin B9. Your cells have sufficient folate to support DNA replication, red blood cell formation, and homocysteine metabolism.

High

High folate from diet or supplementation is generally not harmful because excess folate is excreted in urine. However, very high supplemental folate can mask vitamin B12 deficiency (by correcting the anaemia but not the neurological damage), which is clinically important to monitor.

Low

Low folate causes megaloblastic anaemia — large, immature red blood cells that cannot function properly. It also leads to elevated homocysteine, which increases cardiovascular risk. In pregnant women, folate deficiency in the first weeks of pregnancy significantly raises the risk of neural tube defects (spina bifida, anencephaly) in the baby.

Frequently Asked Questions

What does low folate mean? expand_more
Low folate indicates insufficient dietary intake, poor absorption (e.g. coeliac disease, Crohn's disease), increased demand (pregnancy, haemolytic anaemia), or interference from medications such as methotrexate or anticonvulsants. It leads to megaloblastic anaemia and elevated homocysteine.
Why is folate important in pregnancy? expand_more
Folate is critical for the development of the neural tube (which becomes the brain and spinal cord) during the first 28 days of pregnancy — often before a woman knows she is pregnant. Deficiency during this window significantly increases the risk of neural tube defects. All women planning pregnancy are advised to take 400–800 µg of folic acid daily.
What is the difference between folate and folic acid? expand_more
Folate refers to the naturally occurring form of vitamin B9 found in food. Folic acid is the synthetic form used in supplements and food fortification. Folic acid is more bioavailable than food folate when taken as a supplement.
Which foods are richest in folate? expand_more
The best food sources of folate include dark leafy greens (spinach, kale, asparagus), legumes (lentils, chickpeas, black beans), avocado, broccoli, citrus fruits, eggs, and fortified cereals and bread. Cooking reduces folate content, so raw or lightly cooked vegetables are preferred.
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